<?xml version="1.0" encoding="UTF-8" ?>
<XMLDB PATH="mod/forum/db" VERSION="20160113" COMMENT="XMLDB file for Moodle mod/forum"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="../../../lib/xmldb/xmldb.xsd"
>
  <TABLES>
    <TABLE NAME="forum" COMMENT="Forums contain and structure discussion">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="type" TYPE="char" LENGTH="20" NOTNULL="true" DEFAULT="general" SEQUENCE="false"/>
        <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="intro" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="introformat" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="text format of intro field"/>
        <FIELD NAME="assessed" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="assesstimestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="assesstimefinish" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="scale" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="maxbytes" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="maxattachments" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false" COMMENT="Number of attachments allowed per post"/>
        <FIELD NAME="forcesubscribe" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="trackingtype" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="1" SEQUENCE="false"/>
        <FIELD NAME="rsstype" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="rssarticles" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="warnafter" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="blockafter" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="blockperiod" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="completiondiscussions" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of posts are required to mark this forum completed for a user."/>
        <FIELD NAME="completionreplies" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of replies are required to mark this forum complete for a user."/>
        <FIELD NAME="completionposts" TYPE="int" LENGTH="9" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="Nonzero if a certain number of posts or replies (total) are required to mark this forum complete for a user."/>
        <FIELD NAME="displaywordcount" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="course" UNIQUE="false" FIELDS="course"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_discussions" COMMENT="Forums are composed of discussions">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="course" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="name" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="firstpost" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="groupid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="-1" SEQUENCE="false"/>
        <FIELD NAME="assessed" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="1" SEQUENCE="false"/>
        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="usermodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="timestart" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="timeend" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="pinned" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="forum" TYPE="foreign" FIELDS="forum" REFTABLE="forum" REFFIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid"/>
        <INDEX NAME="course" UNIQUE="false" FIELDS="course"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_posts" COMMENT="All posts are stored in this table">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="discussion" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="parent" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="created" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="modified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="mailed" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="subject" TYPE="char" LENGTH="255" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="message" TYPE="text" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="messageformat" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="messagetrust" TYPE="int" LENGTH="2" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="attachment" TYPE="char" LENGTH="100" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="totalscore" TYPE="int" LENGTH="4" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="mailnow" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="discussion" TYPE="foreign" FIELDS="discussion" REFTABLE="forum_discussions" REFFIELDS="id"/>
        <KEY NAME="parent" TYPE="foreign" FIELDS="parent" REFTABLE="forum_posts" REFFIELDS="id" COMMENT="note that to make this recursive FK working someday, the parent field must be decalred NULL"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid"/>
        <INDEX NAME="created" UNIQUE="false" FIELDS="created"/>
        <INDEX NAME="mailed" UNIQUE="false" FIELDS="mailed"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_queue" COMMENT="For keeping track of posts that will be mailed in digest form">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="discussionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="postid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="timemodified" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false" COMMENT="The modified time of the original post"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="discussionid" TYPE="foreign" FIELDS="discussionid" REFTABLE="forum_discussions" REFFIELDS="id"/>
        <KEY NAME="postid" TYPE="foreign" FIELDS="postid" REFTABLE="forum_posts" REFFIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="user" UNIQUE="false" FIELDS="userid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_subscriptions" COMMENT="Keeps track of who is subscribed to what forum">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="forum" TYPE="foreign" FIELDS="forum" REFTABLE="forum" REFFIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid" UNIQUE="false" FIELDS="userid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_digests" COMMENT="Keeps track of user mail delivery preferences for each forum">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="maildigest" TYPE="int" LENGTH="1" NOTNULL="true" DEFAULT="-1" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="userid" TYPE="foreign" FIELDS="userid" REFTABLE="user" REFFIELDS="id"/>
        <KEY NAME="forum" TYPE="foreign" FIELDS="forum" REFTABLE="forum" REFFIELDS="id"/>
        <KEY NAME="forumdigest" TYPE="unique" FIELDS="forum, userid, maildigest"/>
      </KEYS>
    </TABLE>
    <TABLE NAME="forum_read" COMMENT="Tracks each users read posts">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="forumid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="discussionid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="postid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="firstread" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="lastread" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid-forumid" UNIQUE="false" FIELDS="userid, forumid"/>
        <INDEX NAME="userid-discussionid" UNIQUE="false" FIELDS="userid, discussionid"/>
        <INDEX NAME="postid-userid" UNIQUE="false" FIELDS="postid, userid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_track_prefs" COMMENT="Tracks each users untracked forums">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
        <FIELD NAME="forumid" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="0" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
      </KEYS>
      <INDEXES>
        <INDEX NAME="userid-forumid" UNIQUE="false" FIELDS="userid, forumid"/>
      </INDEXES>
    </TABLE>
    <TABLE NAME="forum_discussion_subs" COMMENT="Users may choose to subscribe and unsubscribe from specific discussions.">
      <FIELDS>
        <FIELD NAME="id" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="true"/>
        <FIELD NAME="forum" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="userid" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="discussion" TYPE="int" LENGTH="10" NOTNULL="true" SEQUENCE="false"/>
        <FIELD NAME="preference" TYPE="int" LENGTH="10" NOTNULL="true" DEFAULT="1" SEQUENCE="false"/>
      </FIELDS>
      <KEYS>
        <KEY NAME="primary" TYPE="primary" FIELDS="id"/>
        <KEY NAME="forum" TYPE="foreign" FIELDS="forum" REFTABLE="forum" REFFIELDS="id"/>
        <KEY NAME="userid" TYPE="foreign" FIELDS="userid" REFTABLE="user" REFFIELDS="id"/>
        <KEY NAME="discussion" TYPE="foreign" FIELDS="discussion" REFTABLE="forum_discussions" REFFIELDS="id"/>
        <KEY NAME="user_discussions" TYPE="unique" FIELDS="userid, discussion" COMMENT="Users may only have one discussion preferences per discussion"/>
      </KEYS>
    </TABLE>
  </TABLES>
</XMLDB>